To hide an Exchange server, follow the steps below:
- Open ADSIEdit.msc, right-click on ADSI Edit, and then Connect to...
- In the Connection Settings window, under the Select a well known naming context dropdown field, select Configuration and ensure the correct domain is specified under Computer
- Expand Configuration | CN=Configuration | CN=Services | CN=Microsoft Exchange | CN=<OrganizationName> | CN=Administrative Groups | CN=Exchange Administrative Group | CN=Servers
- Locate the Exchange server in the list, and deny the ARS Service Account read permissions to the object
- Restart the ARS service
For more information on ADSI Edit, see the Microsoft article below: